Question

In the analysis of perfect trusses using method of section, the section line should not cut more than _________ members in which the forces are unknown




A) Two

B) Three

C) One

D) Four​

Answer 1

Answer:

pleas explain I don't. know

Answer 2

The section line should not cut more than three members in which forces are unknown.

• In the method of sections for a perfect truss, we use a cutting plane in such a way that it should not cut more than three members.
• For a body to be in equilibrium,
• The total Horizontal force ( $F{x}$), Vertical force ( $F{y}$), and the Momentum (M) must be zero.
• i.e  Σ F{x} =   Σ F{y} =   Σ M = 0
• i.e a total of three equations.
• ∴ The total number of unknowns should not exceed 3, since the total number of unknowns should not exceed the total number of equations.